Its origins can be found in two sources, one from 1654, in which construction had not yet begun, and the other from 1716, in which the building of two side walls was commissioned. It was in this period of time that the Church of Sant’Ambrogio was built in Pauli Pirri, a village that, in 1881, took on its current name of Monserrato. Today, its outline characterises the historic centre of the little town, on the outskirts of Cagliari, where Saint Ambrose is the patron saint, celebrated on 7 December. The architectural style is Gothic-Catalan, but when you observe the façade you will notice several unusual elements: an original double sloping roof and the battlements that decorate the lateral buttresses placed diagonally with respect to the main building. Above the portal, there is a pointed arch with an eyebrow element and an oculus, characteristic elements of Gothic architecture. The bell tower stands to the left of the entrance and was rebuilt in the late 19th century after the collapse of the original structure.